You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you  please book a flight ticket from OAK to LAS?

ASSISTANT: Sure, when do you want to start and return on?

USER: Thank you. I have planned my travel  dates as  July 07 and July 09.

ASSISTANT: Do you need a connecting flight?

USER: I am looking for single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No, I do not have any other specifications.

ASSISTANT: Please share your name.

USER: Sure, myself Sandra Martin.

ASSISTANT: Please wait.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thanks for reaching us.

USER: Most welcome.