You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I would like to visit Houston Zoo with my friend, please help me in booking a ticket from IAH to HOU.

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My planned journey dates are on Nov 10 and Nov 12.

ASSISTANT: Do you have any other requirements to be met?

USER: I would like to return in the morning.

ASSISTANT: Can I have your name please?

USER: My name is Andrew Hall.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

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

ASSISTANT: Thank you.