You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Christine Walker.

ASSISTANT: In which way I can assist you today?

USER: I need to attend a summit regarding science and technology in Philadelphia so please help me with flight ticket booking from Houston.

ASSISTANT: Certainly, I will help you in booking flight ticket.

USER: Thank you.

ASSISTANT: May I know your convenient airport names to travel?

USER: Sure, I would like to travel from IAH to PHL as these are very much near to my locations.

ASSISTANT: Is it one way or round trip?

USER: It is round trip.

ASSISTANT: Can you please mention your departure and return dates for booking flight ticket?

USER: Sure, I have planned my travel dates as 07/01 and 07/03 as these are my convenient days to travel.

ASSISTANT: Ok, just hold on a moment, I will check is there any flight available or not, as per your requested dates.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry for the inconvenience Walker, no flights available in this route as per your requested dates.

USER: Oh! It is sad to hear.

ASSISTANT: Do you want to know any thing else from us?

USER: No, nothing. Anyway, thank you for your valuabale time.

ASSISTANT: You are welcome, have a good day. Thank you for contacting us.

USER: Most welcome.