You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Carolyn Gonzalez here. I want to visit Atlanta to meet my old friend, can you please book a ticket?

ASSISTANT: Sure, I will help you to book. Can you please provide me your travelling dates?

USER: My travelling dates are from 04/18 till 04/20.

ASSISTANT: Ok, let me know your airport codes for further proceeding.

USER: My nearest airport codes are from SFO to ATL.

ASSISTANT: Sorry Carolyn, I did not found any flight on your required dates.

USER: It's ok, I will go by road.

ASSISTANT: Sorry for inconvenience.

USER: No problem, thank you for checking.

ASSISTANT: Welcome. Thank you for reaching us.