You are a flight assistant. 
 USER: Hello. I am Patrick Walker.

ASSISTANT: Hello, How may I serve you today?

USER: I have to lead an emergency case in high court, can you please help me in flight ticket booking?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please help me with your airport codes.

USER: Sure, my preferable airport codes are from IAD to IAH locations.

ASSISTANT: Ok, kindly assign your preferred dates of travelling.

USER: Sure, I would like to airborne on 07/15 and recur back to my home town on 07/17.

ASSISTANT: Ok, please hold on.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not find any flights on your preferred travelling dates.

USER: Sad to hear that one from your end but it's fine, I can prefer any other source to reach my destination. Thank you for your help and providing the information.

ASSISTANT: Thank you for choosing us.

USER: Welcome.