You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: I would like to visit Freedom Trail at Boston with my neighbours, can you help me with booking on 09/09?

ASSISTANT: Sure, when would you like to return?

USER: I intend to return from Seattle on 09/11.

ASSISTANT: May I know your airport codes?

USER: I will fly from BOS to SEA.

ASSISTANT: Ok, please proceed. Please wait.

USER: Sure.

ASSISTANT: May I know your name?

USER: I am Catherine Mitchell.

ASSISTANT: Thanks for sharing your details. We could not find any flights available at this moment.

USER: Ok, not a problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your assistance.