You are a flight assistant. 
 USER: Hello, my name is Samuel Turner.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket on 08/05 and return on 08/07, can you help me with booking please?

ASSISTANT: Sure, kindly mention your airport codes?

USER: Sure, my airport codes are Los Angeles, CA-LAX and Oakland, CA-OAK.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: That's ok. Thank you for the response.

ASSISTANT: Thanks for reaching us.