You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Samantha Walker.

ASSISTANT: How can I help you?

USER: I would like to visit Smith Tower at Seattle, could you please help me out in booking a ticket?

ASSISTANT: Sure, I am happy to help you. May I know your travelling dates and airport codes?

USER: I would like to travel on 11/20 from LGA.

ASSISTANT: Ok.

USER: My destination airport code is SEA and my return date is on 11/22.

ASSISTANT: Sure, I am happy to help you. Give me a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you for your information.

ASSISTANT: Welcome.