You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please make a reservation with the name of Katherine Lopez?

ASSISTANT: Sure, I will do that for you. Please let me know your travel dates.

USER: My journey dates are on July 18th and 20th.

ASSISTANT: Noted. Please let me know your source and destination airport codes.

USER: My airport codes are, OAK to IAD.

ASSISTANT: Thank you. Would you like to travel in a connecting flight or a direct flight?

USER: I prefer a connecting flight.

ASSISTANT: Noted. May I know your name?

USER: My name is Katherine Lopez.

ASSISTANT: Thank you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Ok, no problem. Thank you.

ASSISTANT: You are most welcome.