You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am looking to book a flight ticket under the name David Harris, will you help me to find a flight ticket?

ASSISTANT: I can help you with that. May I know your airport codes?

USER: My travelling airport codes are IAD and DEN.

ASSISTANT: Can I have your trip dates to find a flight for you?

USER: My trip dates are 07/10 and 07/12.

ASSISTANT: According to your information, there is no flight for you.

USER: It's ok, thank you for checking  the flights.

ASSISTANT: Thanks for reaching us.