You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy Collins.

ASSISTANT: How may I guide you today?

USER: Can you please help me in booking my flight ticket from IAH to PHL?

ASSISTANT: Sure, I will help you with that. Can you please share your travelling dates?

USER: Ok, my travelling dates are 04/14 and 04/16.

ASSISTANT: Wait for a minute. I am sorry to say that there is no flight found.

USER: Ok, sure.

ASSISTANT: Thank you for contaching us.

USER: Most welcome.