You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have to go Houston for attending a business meeting there, can you please book a flight ticket from LAS airport?

ASSISTANT: Sure, please provide your trip dates.

USER: My departure date is 02/20 and please book my return ticket also on 02/22.

ASSISTANT: Can you share Houston's airport code?

USER: My destination airport is IAH.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: May I know your name?

USER: Sure, my name is Eric Harris.

ASSISTANT: Eric, there is no flight available on these dates.

USER: It's ok no problem, I will go with another airline. Thank you for your information.

ASSISTANT: Thank you to approach us.