You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Carol Taylor.

ASSISTANT: Nice to meet you Carol.

USER: Could you please book a flight ticket from CA-OAK to DC-IAD.

ASSISTANT: Sure, I am here to assist you. Please provide me your travel dates to search best flight for you.

USER: 07/20 and 0722 are my travelling dates.

ASSISTANT: Wait for a moment, let me check.

USER: Sure.

ASSISTANT: Thanks for your waiting, I could not find any flight with your travel dates.

USER: No worries, thank you for the information.

ASSISTANT: My pleasure, have a great day ahead.