You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: May I know your name please?

USER: My name is Thomas Walker.

ASSISTANT: Please wait.

USER: Ok, I will wait.

ASSISTANT: I have found your reservation on your name. Can I know your travelling dates?

USER: My travelling dates are Aug 09 and Aug 11.

ASSISTANT: Please let me know your travelling airport codes?

USER: My airport codes are LAX and DCA.

ASSISTANT: Do you need connecting flight.

USER: I prefer single connecting flight.

ASSISTANT: May I know do you have any other preference?

USER: No, I don't have any other preferences.

ASSISTANT: Sorry, no flights available on your route.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.