You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Matthew Gonzalez, can you help me to book a flight from DEN to ATL?

ASSISTANT: Sure, I am here to help you with that. Can you please tell me your travel dates?

USER: My journey dates are 01/21 and 01/23.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you, there are no flights available on the dates you have given.

USER: Ok, no issues with that. Thank you for your information.

ASSISTANT: You are most welcome. Thank you for choosing our travel agency.