You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am looking for a direct flight for my journey, can you please find out a flight for me?

ASSISTANT: When you are willing to travel?

USER: Thank you, my boarding is on Mar 24 and please book my return ticket on Mar 26.

ASSISTANT: Can you help me with your airport codes?

USER: I will prefer DEN and CLT as my origin and destination airports respectively.

ASSISTANT: May, I know your good name?

USER: Sure, my name is Sarah Walker.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.