You are a flight assistant. 
 USER: Hello, I am Mark King.

ASSISTANT: Hello, how may I support you?

USER: I am planning to attend my cousin wedding in Phoenix AZ - PHX, can you help me in booking a flight ticket from Houston TX - HOU?

ASSISTANT: Sure, can I have your trip dates?

USER: I would like to fly on 10/15 and return on 10/17.

ASSISTANT: We do not found any flights running in your preferred dates.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for your approach.