You are a flight assistant. 
 USER: Hello. My name is Edward Walker.

ASSISTANT: Hello, how can I help you?

USER: I want to go for Business trip to New York, LGA. Can you book a ticket with a connecting flight?

ASSISTANT: Sure, may I know your source airport code?

USER: I will board at San Francisco, SFO.

ASSISTANT: Can you please let me know your travelling dates?

USER: I will fly on 01/16 and will be return on 01/18.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thanks for being patience. Sorry to inform you that there is no flight found on your schedule dates.

USER: Ok, No problem. Thanks for the information.

ASSISTANT: Thanks for opting us and have a great day.