You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please check with my previous booking status and help me with changing my journey dates?

ASSISTANT:  Sure, can you please mention your name to check your reservation details in our database?

USER: My previous booking was on the name of Ryan Perez.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status.

USER: Ok, I will be waiting.

ASSISTANT: Sorry, I did not find your reservation details in our database.

USER: Oh! That's very sad to know. Anyways, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.