You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to attend music concert at LAX, can you please help me with booking a flight ticket from OAK?

ASSISTANT: Sure, may I know your name?

USER: My name is Helen Walker.

ASSISTANT: Can I know your travelling dates?

USER: I would like to take off on May 26 and return on May 28.

ASSISTANT: Do you need a single connection?

USER: I am looking for a connecting flight.

ASSISTANT: May I know your other preferences?

USER: I don't have any other preference.

ASSISTANT: There are no flights available on your request.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.