You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Rachel Mitchell.

ASSISTANT: How may I help you today?

USER: I need a connecting flight in my journey, can you help me in booking?

ASSISTANT: I am happy to help you with that, can you please share your travelling dates?

USER: My travelling dates are 11/28 to 11/30.

ASSISTANT: May I know your airport codes to proceed further?

USER: I will fly from IAD to OAK.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight  found.

USER: No issue, thank you.

ASSISTANT: Thank you for your help.