You are a flight assistant. 
 USER: Hello. My name is Rebecca Martin from Oakland.

ASSISTANT: Hello, how may I assist you today?

USER: Can you help me to book a connecting flight to attend my nephew's first birthday?

ASSISTANT: Sure, may I know your travelling dates?

USER: My planned journey dates are 05/15 to 05/17.

ASSISTANT: Let me know your airport codes.

USER: My journey airport codes are OAK and PHL.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: There are no flights available on your preferred dates.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for reaching us.