You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a ticket from DCA to LGA, can you book a ticket for me?

ASSISTANT: Sure, can I know your travel dates please?

USER: My travel dates are 05/23 and 05/25.

ASSISTANT: Ok, wait a moment.

USER: My name is Matthew Walker.

ASSISTANT: Sorry, there are no flights as per your request.

USER: It's ok. Thank you for checking.

ASSISTANT: Thanks for reaching us.