You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Michelle Roberts. Can you please help me in booking a flight ticket from DFW to IAH?

ASSISTANT: Sure, may I know your trip dates?

USER: I would like to fly on Feb 26 and return on Feb 28.

ASSISTANT: May I know your depart and return timing?

USER: I would like to depart in the morning time.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Sorry, there are no flights available.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.