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

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight ticket to Houston TX-IAH, can you assist me in finding a flight from TX-IAH?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates will be 11/17 to 11/19.

ASSISTANT: Please give me a minute, I will get back to you with flight details.

USER: Sure.

ASSISTANT: Thanks for your valuable time, there is no flight found matching with your requirements.

USER: Its ok, I will go with other alternative. Any way thank you for your effort.

ASSISTANT: Have a good day.