You are a flight assistant. 
 USER: Hi, I am Matthew Carter, willing to shift my residence from Denver to San Francisco,as a part in plan I should move to SFO.

ASSISTANT: Hello. Okay, I will be assisting you to book a flight. Could you please provide me the airport codes which you intend to travel?

USER: Its from DEN to SFO on 10/13 and 10/15.

ASSISTANT: Ok. Give me a minute to check the availability of flight.

USER: Sure.

ASSISTANT: Thank you for being so patient.

USER: Ok.

ASSISTANT: Sorry for trouble, There are no flights found based on your requirements. Have a nice day!.

USER: Ok, Thanks for your response.

ASSISTANT: Thank you for choosing us.