You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Samuel Roberts.

ASSISTANT: OK Samuel, how may I guide you?

USER: I am planning to travel on these dates that is from 07/18 to 07/20. Is there any flights available on these dates?

ASSISTANT: OK Samuel, could you provide your source and destination details for checking the flight availability?

USER: Sure, my travelling codes are from OAK to ATL.

ASSISTANT: OK, thank you for providing me your information. Please wait a moment to check it.

USER: OK.

ASSISTANT: Thank you for waiting, sorry Roberts, there is no flights found as per your dates.

USER: It's OK. Thank you for your response.

ASSISTANT: OK, thank you for reaching us.