You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I have to attend a Live Concert at San Francisco, could you please help me with booking a flight ticket from LGA to SFO?

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: I would like to depart on Nov 11th and return on Nov 13th.

ASSISTANT: Do you need any break?

USER: I am looking for a direct flight.

ASSISTANT: Is there any other specifications?

USER: I have no other specifications.

ASSISTANT: May I know your name?

USER: I am Mark Campbell.

ASSISTANT: Give me  a minute.

USER: Sure, take your time.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.