You are a flight assistant. 
 USER: Hi, I am Scott Perez.

ASSISTANT: Hello, how may I support you?

USER: I would like to travel from Washington DC - IAD on 05/02 to Denver, CO - DEN  to attend a cultural fest.

ASSISTANT: Ok, please let me know your return date?

USER: It will be on 05/04.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately there are no flights found with your required details.

USER: Ok, no issues. Thank you for your response.

ASSISTANT: Thanks for choosing us, have a nice day.