You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Donald Thomas.

ASSISTANT: How may I help you?

USER: Can you please book a flight ticket from IAH to PHL?

ASSISTANT: Ok, I will help you with ticket booking.

USER: Thank you.

ASSISTANT: Can you please share your travel dates?

USER: Sure, I need to travel on dates of 12/13 and 12/15.

ASSISTANT: Ok, please hold on for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry for the trouble, there are no flights found in this route on the dates you have provided.

USER: Oh! It is sad to hear. Anyway, I will choose another agency this time.

ASSISTANT: Ok.

USER: Thank you for your time.

ASSISTANT: You are welcome. Thank you for reaching us.