You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Susan Baker. Can you help me in booking my flight ticket from IAH to PHX?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My travelling dates will be from Apr 30th to May 2nd.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Can you please tell me your depart time and return time?

USER: My depart time should be afternoon.

ASSISTANT: Which class do you prefer?

USER: I am ok, with any class.

ASSISTANT:  Do you have any specification?

USER: No.

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

USER: Its ok, thank you.

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