You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Laura Brown.

ASSISTANT: How may I guide you today?

USER: I want to travel from OAK to ORD. Can you book a flight ticket for me?

ASSISTANT: I am happy to help you with that. Can you please share your preferable journey dates?

USER: I want to travel in the flight on 03/21 and 03/23.

ASSISTANT: Please give me a minute.

USER: Make sure that fare of ticket is 500.

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

USER: That's not a problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your help.