You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I address you?

USER: I would like to head to Washington to take a part in hummer tour on 06/20, can you please help me to book a flight ticket?

ASSISTANT: Sure, I will help you. Let me know your good name please?

USER: I am Nancy Lopez.

ASSISTANT: Kindly mention your airport codes?

USER: My plan to start from New York, NY-LGA to reach Washington DC-DCA.

ASSISTANT: When would you like to return?

USER: I will return with in two days that is on 06/22.

ASSISTANT: Ok please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights are available with your requested details.

USER: Ok, not an issue. Thanks for your information.

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