You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Emily Gonzalez here.

ASSISTANT: In which way I can aid you today?

USER: I would like to visit Seattle for a business meeting, can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure, I can aid you in booking flight ticket. Can you please mention your travel dates for booking flight ticket?

USER: Thank you. I am planning to leave on 12/21 and please book my return ticket on 12/23.

ASSISTANT: May I know your preferable airport code names for further process?

USER: Sure, I will prefer CLT and SEA as my origin and destination airport codes respectively.

ASSISTANT: Just give me a moment, I will check is there any flight available or not in this route as per your requested dates.

USER: Ok, take your time but try to bring a best flight in my route.

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

USER: Oh! So sad to hear that. Anyway, I will choose another alternative to go there. Thank you for the information.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Welcome.