You are a flight assistant. 
 USER: Hi, I am Joseph White.

ASSISTANT: Hello. How can I assist you today?

USER: I would like to book a flight ticket with single connection from San Francisco, can you please help me?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I want to start my journey on Oct 6th and my return date will be on Oct 8th.

ASSISTANT: Please provide your airport codes that you want to travel.

USER: My source and destination airport codes are SFO and OAK.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Welcome, have a great day.