You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I am Christoper Robinson. Please help me in searching a direct flight for me?

ASSISTANT: Sure, I am happy to help you with that. Can you please share on what dates you are willing to travel?

USER: Ok, my travelling dates are 07/08 and 07/10.

ASSISTANT: Can you please provide your source and destination airport codes to proceed further?

USER: My travelling airport codes are HOU and DEN.

ASSISTANT: Please wait for a while.

USER: Ok, sure.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for contacting us.