You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Matthew Roberts.

ASSISTANT: How may I assist you?

USER: I planned to meet my cousin in PHX, can you please help me to book a flight ticket from IAH?

ASSISTANT: Sure, I am here to help you out. May I know your ravelling dates please?

USER: I prefer to travel on Apr 29 and May 1.

ASSISTANT: Do you prefer either business or economy class?

USER: I am comfortable with any class.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I planned to depart in afternoon in a connecting flight.

ASSISTANT: Can you please share your airline preferences?

USER: I am comfortable with all the airlines.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Matthew Roberts, there are no flights available in your route.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you for approaching us.