You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I am Donald Scott. Can you please help me in booking my flight ticket from PHL to IAH?

ASSISTANT: When you are willing to travel?

USER: My travelling dates are 05/03 and 05/05.

ASSISTANT: Please wait a minute.

USER: Ok, sure.

ASSISTANT: Sorry, there is no flight found on your route.

USER: Ok, fine thank you for checking.

ASSISTANT: Thanks for contacting us.