You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jacob Roberts.

ASSISTANT: Nice to meet you.

USER: I am planning to visit Boston Hop-on Hop-off trolley tour at BOS. Can you help me to book a connecting flight?

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

USER: My travel dates are 07/19 and recur on 07/21.

ASSISTANT: Sure, will you mention your source airport code please?

USER: My source is from San Francisco, CA - SFO.

ASSISTANT: Please give me a moment.

USER: Sure.

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

USER: Ok, no issues. Thanks for your response.

ASSISTANT: Welcome, have a great day.