You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Angela Scott from Houston. I would like to visit Los Angeles next week, can you please book a flight ticket for me?

ASSISTANT: Sure, can I know the travel dates please?

USER: I want to take off on 12/27 and please book my return ticket also on 12/29.

ASSISTANT: Could you please provide the airport codes?

USER: I want to fly from IAH and destination airport is LAX.

ASSISTANT: Sorry, there are no flights available on your dates.

USER: Oh! It's ok no problem. Thank you for your service.

ASSISTANT: Thank you for approaching us.